Abstract
In the synthesis of complex oxides, a difference in diffusivity between their cations leads not only to Kirkendall and Frenkel effects, but also to deviation from stoichiometry. As a rule, a solid solution of the oxide containing the cation of lower diffusivity in the composite oxide and a phase consisting of, or rich in, the oxide containing the cation of higher diffusivity is formed. The solid solution concentration depends on the degree of nonequilibrium of the synthesis reaction. The lower this degree, the closer the solid solution composition is to a stoichiometric complex oxide. The solid solution concentration and the second phase present affect all production processes and the properties of ceramics sensitive to them.
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